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What are Virtualized Processors?

April 26, 2017processors virtualized

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What are Virtualized Processors?

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Charm++ and Adaptive MPI are based on the notion of virtual processors: progammers target their program to a large number of (logical or virtualized) “processors”, independent of the number of physical processors, and the runtime assigns many virtualized processors (VPs) to physical processors. The programmer chooses the number of virtualized processors used based on application-structure considerations, while keeping the amount of work per VP above a minimum threshold to limit the effects of runtime system overhead. In this way, the programmer is free to pursue the problem independent of the number of processors and effective parallel progamming is made much simpler. Each VP may just be a C++-style object, but to program MPI and other applications, a user-level thread can be embedded in such an object. These user level threads are extremely lightweight and migratable across processors, and are called “Virtualized Processor Threads”. This idea of virtualization is distinct from “Virtua